2

OK, STOP IT!:
Generally it is a bad habit, but there may be help for you yet! try this web md web site for some good advice including remedies such as coating your nails with a bitter polish to decreasing stress through other means etc. Good luck to you.
http://www.webmd.com/beauty/nails/stop-nail-biting-tips.
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3

Nail biting:
Once you get into this habit it is difficult to break. You could try soaking your finger tips into a paste made of soem bitter melon and leaving it on for about 10-15 miinutes and then just wiping the paste off wihtout washing it off. Then if you will not want to put those finger tips into your mouth to nibble at your nails. It is totally benign as far as side effets go.
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5

Nail biting:
Nail biting is usually a nervous habit that can be hard to stop. Some methods that have worked include application of otc nail lacquers that contain foul tasting or hot substances that make biting distasteful. Also occasional oral meds such as a ssri or other anti-anxiety meds may work.
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9

Different Options:
There are a few ways you can stop biting your nails. One way is to pick one nail and not bite that one for awhile, once it has been about 2-3 weeks notice how good that nail looks. Then, pick another nail and don't bite it for awhile, continue this until you aren't biting your nails anymore. Another step is to keep yourself occupied, chew gum or do an activity that requires using your hands.
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10

Hot sauce:
Apply a hot sauce, such as tabasco or cayenne pepper seasoning, to your nails with a q-tip. Unless you're a mexican food junky, that should be an effective deterrent. At the same time, ask your doctor to recommend a counselor or other mental health professional who can help you determine why you bite your nails, and what you can do about that underlying cause.
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11

Notice it:
Often if you can notice that it is happening, you can stop these kinds of habits. However, some will paint their nails with jalapeno juice or some other vile taste to help remind you not to. The other thing you try is to carry nail clippers or files with you, as often it is the desire to clear a hangnail that starts it.
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14

Different Options:
There are a few ways you can stop biting your nails. One way is to pick one nail and not bite that one for awhile, once it's been about 2-3 weeks notice how good that nail looks. Then, pick another nail and don't bite it for awhile, continue this until you aren't biting your nails anymore. Another step is to keep yourself occupied, chew gum or do an activity that requires using your hands.
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15

Put something...:
On them that tastes terrible, yet is harmless - lemon juice, castor oil, hot pepper juice etc. There is also a application called "thumb" that is made just for this purpose.
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16

Psychotherapy:
Assuming the biting and cutting have been occuring for a few weeks or more, i would suggest the individual meet with a mental health professional, preferably one well versed in cognitive behavior therapy.
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17

Difficult!:
Nail biting is a very difficult habit to break. One thing you could do is have your child keep his hands covered with gloves to break the cycle of nail biting. Gently removing the childs fingers from their mouth each time you notice them biting is another method. In pharmacies, if you can find it, is nail biters liquid. This is a very bitter liquid painted on to the nails, and discourages biting.
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19

Yes:
Biting your nails can damage your teeth. It can also break anterior fillings and ceramic crowns and veneers. The action of the nail biting put unusual stress and leverage that can be detrimental to the enamel of tooth. It does not seem like it would but I have seen numerous fractures from someone biting or chewing on something they should not have in mouth.
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20

Put something...:
On them that tastes terrible, yet is harmless - lemon juice, castor oil, hot pepper juice etc. There is also a application called "thumb" that is made just for this purpose.
...Read more